[2,3] Sigmatropic Rearrangement of Unstable Sulfur Ylides from Allyl Sulfonium Salts. Comparative Study of Electrochemical Reduction with the Base Method and Mechanism Elucidation by the MO Method
作者:Yuichi Okazaki、Fumio Ando、Jugo Koketsu
DOI:10.1246/bcsj.77.1687
日期:2004.9
reduction of sulfoniumsalts in acetonirile under the presence and absence of benzaldehyde were carried out and compared with the results of the base method. Under the presence of benzaldehyde, the electrochemical reduction gave epoxides as a result of a Corey-Chaykovsky reaction confirming ylide formation. The electrochemical reduction of sulfonium salt without benzaldehyde yields the same [2,3] sigmatropic
Synthesis of chiral non-racemic substituted vinyl aziridines
作者:Kordi Chigboh、Daniel Morton、Alan Nadin、Robert A. Stockman
DOI:10.1016/j.tetlet.2008.05.090
日期:2008.8
Synthesis of a range of chiral non-racemic vinyl aziridines with varying substitutions on the alkene has been achieved by the reaction of (SS)-tert-butylphenylsulfinimine with a range of ylides derived by deprotonation of substituted allyltetrahydrothiophenium salts. Yields of the substituted vinyl aziridines range from 0% to 90%, with trans:cis ratios between 1:1 and 0:100 and diastereomeric excesses
Asymmetric Sulfur-Ylide-Mediated Formal [4+1]-Annulation Reaction: Scope and Mechanism
作者:Sébastien Clergue、Olivier Rousseau、Thierry Delaunay、Geoffroy Dequirez、Trieu-Van Tran、Soumia El Aakchioui、Gabriella Barozzino-Consiglio、Raphaël Robiette
DOI:10.1002/chem.201801874
日期:2018.8.6
A formal [4+1]‐annulation strategy between sulfurylides and 1,3‐dienes was developed to afford functionalized cyclopentanoids. The process consists of a stereoselective cyclopropanation reaction followed, in situ, by a stereospecific MgI2‐catalyzed vinylcyclopropane–cyclopentene rearrangement. The use of chiral sulfurylides provided cyclopentanoids with excellent enantiocontrol. A combined experimental
开发了一种在硫醚和1,3-二烯之间形成正式的[4 + 1]环化策略,以提供功能化的环戊烷类化合物。该过程包括立体选择性环丙烷化反应,然后原位进行立体特异性MgI 2催化的乙烯基环丙烷-环戊烯重排。手性硫的使用为环戊烷提供了优异的对映体控制能力。结合实验和计算机理的研究表明,重排的立体特异性可以由涉及碘化物的双重S N 2反应机理解释。
Direct Synthesis of Substituted Vinyl Aziridines
作者:Robert Stockman、Kordi Chigboh、Alan Nadin
DOI:10.1055/s-2007-990956
日期:——
Synthesis of a range of vinyl aziridines with varying substitution on the alkene has been achieved by the reaction of N-(di-methylsulfamoyl)phenylimine with a range ylides derived by deprotonation of substituted allyltetrahydrothiphenium salts. Yields of the substituted vinyl aziridines range from 57% to 77%.
[EN] ANTAGONISTS OF GONADOTROPIN RELEASING HORMONE<br/>[FR] ANTAGONISTES DE LA GONADOLIBERINE
申请人:MERCK & CO INC
公开号:WO2000004013A1
公开(公告)日:2000-01-27
The present invention relates to compounds of formula (I) which are non-peptide antagonists of GnRH which can be used to treat a variety of sex-hormone related conditions in men and women, to methods for their preparation, and to methods and pharmaceutical compositions containing said compounds for use in mammals.